Can't resist it . . . there's a type of yodelling from Georgia, Eastern Europe, that's called "Krimanchuli". It's rather more aggressive than the U.S. or Tyrolean versions and it's tricky because it's not in a western scale . . . but I like it. Had to learn it by ear though as it's not in any books, as far as I know. Though it might be in "99 Georgian Songs" pub. by Black Mountain Press, but I'm not sure 'cos I haven't received my copy yet.
Ohh del i ya heee ya delo eeyah ohhhhhhhhhhhh - yohhhhhhhhhhhh! (Naduri)